Patent GB-347110-A (GB)
Title: Combined milling and drilling machine
IPC: B23Q39/04
Filed: 1930-01-20
Abstract: 347,110. Combined milling and drilling machines. MELLING, G., Belden Road, Jackson, Michigan, U.S.A. Jan. 20, 1930. No. 1991. [Classes 83 (ii) and 83 (iii).] In a combined milling and drilling machine workpieces are carried by a turret to two sets of milling cutters, to a drill and to a reamer, all the tools being secured to vertical spindles of which those carrying the milling cutters are mounted on pivotal carriages oscillated by cams to feed the cutters into the work. The carriages and drill heads are mounted in opposed relation on a central pillar passing through the turret and the drill-spindles are fed vertically by racks and pinions operated from a cam. The machine comprises a bed 1 carrying a support 2, Fig. 5, for the central pillar 4 and for a bearing 6 upon which the turret 7 is rotatably mounted. Crossheads 9, 11 are secured to the pillar by bolts 10, 12, the former carrying, at opposed sides, a drill head 42 and a reamer head 43, whilst the latter carries segmental guides 13, Figs. 2 and 10, for the opposed milling-cutter carriages 14 which are pivoted at 15 on projecting arms 16 of the crosshead 11. Springs 32 press the carriages against a double cam 31 rotatable on the pillar 4 and oscillated by an adjustable link 37, Fig. 2, operated by a cam 36, Fig. 4, on the cam shaft 69. The slide bearings 19 for the carriages have plates 20 adjustable by screws 21. The milling cutters 18 are mounted on spindles 17 journalled on the carriages 14 and are rotated continuously by bevel gears 23 engaged by pinions 27 on shafts 25, 26, journalled in brackets 22 pivotally supported above the carriages. The shafts 25, 26, which are capable of axial movement, are journalled with universal joints 28 to maintain the drive during oscillation of the carriages, and are driven from a main pulley 207 through a clutch 209, hand controlled at 110, a shaft 30 and gearing 111, 113. Flywheels 24 are mounted on the cutter-spindles 17. The drilling and reaming heads 42, 43 are attached to the crosshead 9 by brackets 44 and carry tool spindles surrounded by sleeve-racks 46 engaged by pinions 48 on shafts 49. A cam 67, Fig. 4, on the cam shaft 69 acts through a rocker arm on a link 64 pivoted to a lever 63 attached to one shaft 49 and the other tool is fed simultaneously by means of a link 70 connecting the lever 63 to a bent lever 71 on the other shaft 49. A spring 73 acts on an arm 72 attached to one of the shafts 49 to retract the tools. The spindles carry gears 53, 54, Figs. 4 and 5, the former being driven from the pulley 207 through clutch 209, shaft 30, gearing 111 and a bevel pinion 56, whilst the latter is driven from the former through a shaft 60 and bevel gears 62. Turrets.-The turret 7 is provided on the exterior with vertical rectangular strips 8 for indexing and locking. A slide 74, Fig. 4, is reciprocated in guides 75 by a cam 76 on the shaft 69 acting on a roller 81 on a vertical lever 77, pivoted at the top and connected by a link 80 to the slide. A pawl 85 pivoted on the slide is pressed by a leaf spring 86, also on the slide, against the turret to coact with the strips 8 for indexing, and locking is effected by a pawl 87 mounted on a stationary pivot 88 and provided with a rectangular notch adapted to receive a strip. The slide 74, when allowed by a cavity in the cam 76, is moved by a spring 82 to cause the pawl 85 to engage the next strip, and simultaneously a roller 90 on the slide acts on a lever 91 attached to the pawl 87 to withdraw it from locking engagement with the turret. The cam then moves the slide and pawl 85 forwards to index the turret and maintains the slide in the advanced position for the greater part of its revolution, a spring 92 attached to the slide and the lever 91 causing the pawl 87 to snap on to the next strip 8. A second spring 93 assists the spring 92 and maintains the pawl 87 in position as the slide 74 moves rearwards. Work-holders.-The work-holders on the turret 7 each comprise blocks 96, 97, Figs. 9 and 13, the former carrying a stationary adjustable jaw 98 having a notched face for engaging the shank of the work 100 and the latter carrying a rotatable segmental jaw 103. A further jaw 101 is pivoted to the turret at 101<1> and is positioned by a set screw 106. The jaw 103 is rotated by a spring 109 to press the work against the stationary jaws at a point between them and an adjustable screw 105 locates the end of the work. The screws 105, 106 are locked by spring pins and a handle 108 is provided for rotating the jaw 103 to release the work. At the drilling and reaming stations the turret passes over brackets 206 depending from the drill-heads, the brackets giving additional support to the work and taking the end thrust of the tools. Automatic-stop feed motions.-The cam shaft 69 carrying the cams for feeding the milling-cutters and drills and for indexing the work turret is driven from the main pulley 207, Figs. 2 and 4, through clutch 209, gearing 111, 113, belt 117, and worm gearing 121, a clutch 120 being interposed between the worm shaft 119 and the pulley 118. A link 124 connected to the turret-locking pawl 87 acts through levers, a rock-shaft 122 and a link 126 to oscillate a bell-crank lever 127 to raise a link 129 when the turret is unlocked, the link 129 being attached to the clutch. The link 129 is thereby placed in the path of an arm 130 on the cam shaft so that the rotation of the latter will disconnect the clutch and prevent further rotation of the cam shaft if the pawl 87 should fail to be returned to the turret-locking position. A second rock shaft 131, manually operated at 132, is connected by levers and a link 134 to the clutch lever 135, to which the link 129 is pivoted at 136. Making linkwork ; milling-cutters.-The operator opens each work-holder by means of its lever 108 as it arrives at the front of the machine, and replaces a finished work-piece by a new blank. At the first station a gang milling-cutter 18, Fig. 17, faces the sides of the work, which may be a forkend as shown, or other work. At the next station the work is drilled, at the next the burr produced by the drill is removed by a finishing cutter similar to the cutter 18, and at the last station the hole is reamed.